Rust中的结构体及方法语法

Posted 2022-08-19 aguncn

这个可以和类作比较，或是go当中的方法比较。

#[derive(Debug)]
struct Rectangle 
    width: u32,
    height: u32,


impl Rectangle 
    fn area(&self) -> u32 
	self.width * self.height
    
    
    fn square(size: u32) -> Rectangle 
	Rectangle width: size, height: size
    


impl Rectangle 
    fn can_hold(&self, other: &Rectangle) -> bool 
	self.width > other.width && self.height > other.height
    


fn main() 
    let rect1 = Rectangle  width: 30, height: 50;
    let rect2 = Rectangle  width: 10, height: 40;
    let rect3 = Rectangle  width: 60, height: 45;

    println!("Can rect1 hold rect2? ", rect1.can_hold(&rect2));
    println!("Can rect1 hold rect3? ", rect1.can_hold(&rect3));
    println!("rect1 is :#?", rect1);
    println!(
	"The area of retangle is  square pixels", rect1.area()
    );
    println!(
        "The area of retangle is  square pixels", area(&rect1)
    );

    let sq = Rectangle::square(5);

    println!("square is :#?", sq);
    println!("The area of Square is  square pixels", sq.area());


fn area(rectangle: &Rectangle) -> u32 
    rectangle.width * rectangle.height